Try this as often as you like. You will get a different set of questions each time you attempt this quiz.
Which one of the following materials is the best insulator?
Rubber
Iron
Brass
Copper
The pull on the electrons by a battery in an electric circuit is more commonly called the
electromotive force of the battery
voltage of the battery
potential difference of the battery
energy of the battery
What energy change takes place when a battery is connected to a light bulb?
Chemical → electrical → light
Chemical → light → electrical
Light → electrical → chemical
Heat → electrical → light
Which is the correct symbol for potential difference?
V
A
P
W
Which one of the following is the unit of resistance?
Ohm
Volt
Amp
Joule
Which one of the following statements is CORRECT?
Current is measured in amps and has the symbol I
Voltage is measured in amps and has the symbol I
Current is measured in amps and has the symbol C
Resistance is measured in volts and has the symbol R
Which one of the following graphs shows the relationship between the potential difference (voltage) and current for a resistor in a circuit at a constant temperature?
Name the measuring instruments X and Y in the circuit shown.
X = ammeter, Y = voltmeter
X = multimeter, Y = ohmmeter
X = voltmeter, Y = ammeter
X = voltmeter, Y = ohmmeter
Which one of the following formulae describes the relationship between the potential difference (V) and the current (I) for a resistance (R)
V = IR
R = V÷I
V = I÷R
I = RV
The potential difference across a resistance of 2 ohms in a circuit is 12 volts. What is the value of the current passing through the resistance?
6 amps
24 amps
1/6 amp
14 amps
What is the resistance of a piece of wire when the current flowing through it is 0.12 amps and the potential difference across is 12 volts?
100 ohms
1.44 ohms
12.12 ohms
0.01 ohms
What is the potential difference across a 50 ohm resistor when the current passing through it is 0.1 amps?
5 volts
50.1 volts
0.02 volts
50 volts
A 60 ohm resistance is placed across a 12 volt battery. If an ammeter is placed in the circuit as shown, what current will it read?
0.2 amps
2 amps
48 amps
5 amps
The unit of current, potential difference and resistance respectively are:
amps, volts and ohms
volts, amps and ohms
joules, volts and amps
amps joules and ohms
Name the devices labelled A, B and C in the diagram shown
A = bulb, B = resistor and C = battery
A = battery, B = resistor and C = bulb
A = bulb, B = battery and C = switch
A = resistance, B = switch and C = battery
The flow of electric charge in one direction only in a circuit is known as:
direct current
alternating current
potential difference
resistance
The volt is the unit of
potential difference
electric current
temperature
resistance
Which one of the following energy changes occurs in a resistor?
Electric energy changed to heat energy
Electric energy changed to light energy
Heat energy changed to electric energy
Heat energy changed to light energy
Using the triangle shown, what is the expression used for calculating the current flowing in a circuit?
I = V/R
I = VR
V = IR
R = V/I
Which one of the following symbols is that for the variable resistor?
The graph shown is that for voltage against current for a length of resistance wire. What is the resistance of the wire?
5 ohms
0.2 ohms
0.8 ohms
45 ohms
The relationship between potential difference (V), current (I) and resistance (R) for an electrical circuit is known as
Ohm's Law
Murphy's Law
Einstein's Law
Boyle's Law
Electricity is caused by a flow of protons.
FALSE
TRUE
Copper is a good conductor of electricity
TRUE
FALSE
Which one of the following statements is incorrect?
Plastic is a good conductor.
An insulator does not allow charges to pass through it.
Electrons are not free to move from atom to atom in insulators.
A conductor allows electric charge to pass through it.
Which one of the following statements is incorrect?
When a switch is closed in a circuit, no current flows.
An electric circuit is a complete loop around which a current can flow.
A switch is a device for turning on and off an electric current.
An electric current is a flow of charge.
Which one of the following does not give us an electric current?
A bulb
A power supply
An AA battery
The mains supply
The potential difference of a battery is often called
voltage
current
resistance
conductance
Which of these voltages would be the most dangerous?
230 V mains voltage
1.5 V AAA battery
10,000 V Spark from a car door handle
10,000 V electric fence
The positive and negative terminals of a power supply are colour coded. What are these colours?
Red = Positive and Black = Negative
Yellow = Positive and Black = Negative
Black = Positive and Red = Negative
Red = Positive and Yellow = Negative
Which one of the following is a conductor?
Pencil lead
Paper
Plastic
Glass
Which one of these statements is NOT correct?
The symbol for potential difference (voltage) is P.
Voltage is measured in volts.
Potential difference is measured with a voltmeter.
A AAA battery may be tested with a multuimeter.
Which one of these statements is NOT correct?
Electric current is measured with a voltmeter.
The unit of current is the amp (A)
A multimeter can also measure current.
Resistance is measured in ohms.
The ability of a body to oppose a flow of charge through it, is known as
its resistance
its solubility
its potential difference
its conductance
Which one of these statements is NOT correct?
Copper has a very high resistance
The unit of the resistance is the ohm.
Resistance may be measured using a multimeter.
An ohmmeter is used to measure resistance.
Which one of the following has the highest resistance
A plastic ruler
Lead in a pencil
Metal ruler
Nichrome wire
Current is passed through a resistor, and the voltage across the resistor measured using a multimeter. What will happen to the voltage if the current is doubled?
The voltage doubles.
The voltage is halved.
There is no change in the voltage.
The voltage starts increasing steadily until it goes off the scale of the multimeter.
Current is passed through a variable resistor, and the current is measured using an ammeter. The voltage is kept constant. What will happen to the current if the resistance is doubled?
The current is halved.
The current is doubled.
There is no change in the current.
The current reduces to zero.
Which one of the following equations represents Ohm's Law?